what are dimensionals and physical constants ? give examples

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$C o n s \tan t s w h i c h h a s n o d i m e n s i o n a r e c a l l e d p h y s i c a l c o n s \tan t o r d i m e n s i o n a l l e s s c o n s \tan t s . E x : 2, 4, 6, 1 e t c C o n s \tan t w h i c h h a s s o m e d i m e n s i o n s b u t u s e d a s u n i v e r s a l c o n s \tan t s a r e c a l l e d d i m e n si o n a l c o n s \tan t s . E x : a c c e l e r a t i o n d u e t o g r a v i t y g = 9.8 m / s^{2} (a t t h e s u r f a c e o f e a r t h) .$

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